The Siemens SIRIUS 3RV1902-1AS0 is an undervoltage release (UVR) designed specifically for motor circuit breakers in the S00, S0, S2, and S3 frame sizes. Rated at 500 V AC at 50 Hz and 575 V AC at 60 Hz, this release matches the line voltage of common industrial mains in 400 V and 480 V class systems. The insulation voltage is rated 690 V with pollution degree 3, meaning it's suited for the conductive environment typical of control panels without sealed enclosures.
Snap-on mounting onto DIN rail. The 18.5 mm width and 68 mm depth fit the accessory bay. Front is IP20 finger-safe. The 90 mm height matches the S00–S3 breaker profile, so the release sits flush with the breaker body. No auxiliary contacts are integrated (0 NO, 0 NC, 0 CO), so any status signaling must come from the breaker's own auxiliary switch block.
The 3RV1902-1AS0 is a phased-out product. The manufacturer's designated successor is the SIRIUS 3RV2902-1AS0, listed as the preferred replacement type.